Facebook COO Sheryl Sandberg has joined the billionaire's list with the Facebook stock price at an all time high. Picture: AFP.Source: AFP

Facebook shares have climbed to a new high, catapulting chief operating officer Sheryl Sandberg on to the roster of tech billionaires.

Shares of the world's leading social network closed the Nasdaq trading day on Tuesday at $US58.51, shedding a few cents in after-hours trade.

It's more than triple the social network's lowest share price in the $US17 range in September 2012 and significantly higher than its IPO price of $US38.

Investor confidence in Facebook has been bolstered by the company's aggressive mobile strategy, which included monetising the platform through sponsored posts and ads. In Australia, Facebook has over 12 million monthly active users on its network, 7.3 million of whom are accessing it on their mobiles daily.

Sandberg owns about $US750 million ($A854.02 million) worth of Facebook stock and is said to have sold about $US300 million worth of shares since the California-based company became a publicly traded company in May of 2012.

The 44-year-old former Google executive is also reported to have stock options for nearly five million shares that began vesting last year.

The social media giant started by Mark Zuckerberg, which now has more than 1.1 billion users around the globe with 669 million on mobile, had a rocky debut after it went public at $US38 a share with a valuation of $US16 billion.

Facebook shares dropped below $US20 during the ensuing months and only climbed back over their offer price in July of last year. Zuckerberg, who will turn 30 in May, has a personal fortune estimated at about $US19 billion.

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